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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b8860349b97bbf4c06f1a63cce926efc5e4c1b06100956f8d01ebb33f5b830e' 
  AND token = 'N5EUdMtKXpSlVf43nTiY/Yf9GcWOL/JRnuFLLQwtlH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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