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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00f9bf2041601911197c1457c8744e8e674bf9b0ced36b4d3528ad491db81c73' 
  AND token = 'b0xhw3wdJ6N0NS8nj3iaSk9zetXOjYRt+LiyRBwv7CU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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