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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74be2aaeee2cd34cb9f6b633b5ea4eea8d4c100d278cebf6dc50ef5d8b2233ac' 
  AND token = '0DH+cnBEj/sNES0NE8L0gWo5grzOsFD3l2bLqVIycXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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