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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31b0e9fa02499ac568a36461101b8d38f3855c1eeade2ab672366a4f89de83c2' 
  AND token = 'QxY5jFUNR3gc+SMdSngc+DuDL4BGk21fd4D7ppQEhoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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