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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f06cb1bc42c9ec04278e02e069e0e041046f6449f467f59eaff3e607b74e5657' 
  AND token = 'LSLCOgpAUA0th67FE5OwXj7wTPKz5EJSCeaAvC/KkG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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