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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b689339e641000869185b0d8ae362331fb89dbe0b927f7b6c3c2e1d37fd13838' 
  AND token = 't9oqi6hIzv7a5e+2WIeVpgrHKeRMTCux1KrRw0r7+Ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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