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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd20119ab13d5240f160f7f5bc04ad2275076081bed4ad6440ea709c2f1154a02' 
  AND token = '6BhgrZkm6707oanGzqexGUglNiBCeTRZHxB+oqoJ6Ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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