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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbfd7a113419f14b35b0a6b13397ed6b2ece8247e2503d824cebbd43be30f292' 
  AND token = 'GnQ2GTIPuRFWmTWxtaJ9tjAXhZD3wqLun4tmp2aTVnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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