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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebdae5a531d83859ef6e7e222934a5b7e280da2b049eca631754a0af01538812' 
  AND token = '0noCb0zfvJMxNkAb5RvXLFSP8GweTyq15SADoOowzFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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