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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93204b2df0e7d8217207492b3fe0a47522317c6b73f1e986283828e1e577c01b' 
  AND token = 'E9bbXb8oil52E1xyEoKxiOxgw6XmzBDKPUoP6x+ZPHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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