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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bc1292dde26b6c079e8ba3a39e20c77be9624b5f03a1c6aab0ce453c9edc2a9' 
  AND token = 'rjPzvcumIvQY5LT8OY2qoJUK2JV8YoDcWBgQ4EGQh1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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