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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f852646e12af19065c64b71ea50b207fd0e60d9093b1793ce47dbb0b543ab6f8' 
  AND token = 'i5041iSkfCcxWbwKNetQFn6+s34OLUCOoB+nE2/xIBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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