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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa453efd1d619bc6b07a6cb2ccfc796d61be26883a8dcc76e980c08c4b249051' 
  AND token = 'PNE0GktyTO+O6JsphqYTvc57N3isJvlRnI2N2TWOqOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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