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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3c94f3ce1cdeffbb15adfd1b3714480b32dbcfff8f4ab1b613a568cfa9d57d2' 
  AND token = 'vkeIjwsXz/zSV1d1omtqTrREY9s6sUsphHaqxiYUwZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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