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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53fc981cef5abf1efc303839b550bfcbac98df150df740ef5b2597c468b58c25' 
  AND token = '3muUcF1GqWwgThNkQYM/zjaavsOMidVK6bINkWQ6cEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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