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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4aee83a9a02060fc24ac015e6c987985c5b4f3e2acebeb5441cf036bb7e4b074' 
  AND token = 'fHNttnnw/cUa5+94C1J79LlBwNlWXNjegVuB63mYJmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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