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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd78772c01db0fc492530e085128977ad00e66831c71dafd013378f6c403a7486' 
  AND token = '7MY54h05+iGb97R82qGUH5OwcltqNQb1IY1WvCehZHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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