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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79d1494c3358f7d0e99b299734f97dda81792d265aa28b4b1f9a41e8a379ef18' 
  AND token = 'CASylk1lvAOVjs7COT3MzYGr6woiiBNAJ8xm3UxBndU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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