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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fb10b0271d2489dca2c5b2a913ef050ef9f70ae569a68b1f93929e0951b0180' 
  AND token = 'UzCyfRPUlZzI0o1zPqptoJyf7umwYJTzH83k0MeGs/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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