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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff36bdbe6caa87326e3c2500f0c1f95f7e65f0ac826d18e60ae6314cd1dfebea' 
  AND token = 'RZNFp1anI+uImkIvQRGhh/FJYfKANMRKpGT0jCUl/a4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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