SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1a8872c0596640f926df92e5f8fed1b58977e0ff319b6894453af71f746182b' 
  AND token = 'FmN6W4KzbAQ0CKINQvW4X+2ZJ9/4tN/IkB5gcioGPPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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