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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9003ed88a99280159d336f82aa4f98950eebd00f0a5d09afcd9718be6a4d268' 
  AND token = 'woMO4co0+vJXAYVMkDzBobcWXy/4taC5Zx/BhNxPlV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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