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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b96682aa8c31ff138e99f2232dcdb02fd410ead3b9aa64603d4f10bca03656a5' 
  AND token = 'i5jijy9ZjyLm4ACN2mfQ2f380b4u/wsNY6FprDtfM4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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