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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26cd96cf8e9cf70729e40cd1df6dd2c263bffc602bf3e76084c92dc177b5eb2c' 
  AND token = 'IDsz59AbYuqxevxbqyBGR+hpk6xu14AUBtBSrT2sRKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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