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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caa7f9605c1686f7049cef9e1211ae36e6d75c0d4eb6cf05f89e9cca4e4daf87' 
  AND token = 'S3wD807bDaQW9Pku2pw7XJ83dW5iCSCSM8JP38h25e0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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