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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f04d00ff94f968cdfb731651a2b80784fff99c9804bd5ec3783a359031692e4f' 
  AND token = '0Qshxg5vl9G0XlTHMeRh8z9Pf6orFsGGPn19V3Nop3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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