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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aabba0e06b5da6b25c71c5be26ebb5be68e8c4551160f008186d65fd0c58dc6b' 
  AND token = 'lnnKkXtVQTRPeqJ5P+e9w8i7K+BQiU4qhv4xXxG2AOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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