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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '959d12c43a72b6864df2731d9da010c3df61bed414af7a5bbe850ebb14d8dcd7' 
  AND token = 'E7GE+gE+9/5YKQldKSl2sDHdH5V+1IHXDXl7Fle735s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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