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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43bb5bd09dd77439ef62f6a5882d4f818cd8a827495a23dc59c885b3535b52d6' 
  AND token = 'fbxcvBo6AzucL5cD+QfR4KO/QHPtY0/PyThPBMnoIX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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