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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4aec2125e268314d8faca35e1923fa241614e6f855d8d813d6a0bdb7b0343e53' 
  AND token = '64jNmDH/BNpiqBHiguSx++OFbf3U25JRLXgfr0aGsoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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