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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26cf58fe6f441128b74a7105a3fc753a3e9a69cab1ace74dd70551626d390295' 
  AND token = 'p+AQD4gi2+Kxssm6k4JydGv9yRccRXgaOTHBu1cb6/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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