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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc72bff1a047c0336cd755e09519abb8ae04ba8a5c1e558ae78592695f2edc12' 
  AND token = 'aArlEB7ocLrceZZtBU8a4dcNTzCC+xEcJo2zp4x1bG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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