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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63e75840c5f35313fc0c94362a31e4cab395937fa5bcd95214f4b3662ba0ab24' 
  AND token = 'D7X7kkcmbgDgXLaifYL0KUyzqfla0tdYg646odHlImk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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