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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c07dd5a7b6d23f8b1e7ec961a0c1a1e3c1b5bd8932e08bd09220966090c27a4f' 
  AND token = 'vWdIDtv0YfqFCquSegc1TDz3/fIIhzNmibNneHvXS7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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