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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c217fbacb44882e3f36b2232a2477a451fdc17c403b1b35782a83cb4d2d0330' 
  AND token = '3fkxDM3dCs5TcNLIF/V5KWpMHng+TVJk8VhDxE+ci8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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