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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f896075cfc518bebca0bae341f2469c476792d9c1a64734f0cb9b76a4b1cbf57' 
  AND token = 'ycY3ZhFNHNYntnGlF10rLyQ0Wu8y3c1bwjk0XVSu/UA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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