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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5a9c5e568c335bc61ba8eef9ab5dba1874613984426ff5c6a683b300627ce6e' 
  AND token = 'arUFy7JyjUTgjU0SYqP/OAREYEatoDrhTWqH75ErCgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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