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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8103da11fe2d596f21af05dcb0b0eacf54cf2385a1f690daae42aff7cd96c50b' 
  AND token = '8820OeE+WkO3K3/MbiVCTTUcp7z3c8qw6I3MxMY5zco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}