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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4bc48ef9eb0ea7cb9acfcfb4ae7dc9f8037b27dc3ce588758e3347f53d48a69' 
  AND token = 'RFbrZ9wFWc5tdn5hg2wWkhC25pxGqswRQ0mFIeDDsEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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