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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddcf5c9a80393ff66e43c142a6a36ff25efc3c886163ae830ab88c09e6a9f954' 
  AND token = '8UktXVqgBmhks6xW7jIimmDuxpK2lI0rMVbOx9iFjVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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