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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53831905522da29bf80c18497535ba7c447e3fc83a100f39296019c788971773' 
  AND token = 'o8e/oouo6B14n5gr1ikemRaiYIOyV6RhP2lJX0qgg94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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