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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7bf08f7fc9085bf532c9518751bc9ca7adcc56cb3db34694c7788eda00f672e' 
  AND token = 'tIgoMFNNNf4x5yq0DQ3eMlyxd4v13iar9K/0z6s4T9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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