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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8459bdacc9a266cfcdd7d704f8b0e431085e9654a2d017ef7fe9d881a39064e' 
  AND token = '0xUzgY6hhh7JE3jY9KmA4qCv7dQ69rOYkklORYeMA8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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