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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e892a13e1b616a8738ca8e47a58cfac85d176a5dad1dec3a8c8906e6c46de74' 
  AND token = 'Id1kMhzRQIMcJIXu/nL5D1squvp6ZmppbiuH3t6zCGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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