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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33c17a63d2e102941ba6967f4bbc96389986953fd79b7ba36b844cc2ab994ffe' 
  AND token = 'lI2MblFjHEBZ6Lu4OE59S/CwUGm4Pdj1eOiwjhmAtxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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