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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '575d6ab50861d57cd0feacba87e9e55af419f15096d160adac71e230091be2cc' 
  AND token = 'u+5Srjh806kO/6dL694wfmhYLOVr1drh+HpUMxfwIuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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