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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ac939800e3cec099b9651f19ca100afffaadf47eabb34045cc8066e4809cd90' 
  AND token = 'ApbLL4siQtIk8X+thn6PMBQjsWDAt39dySGLEVZyvUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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