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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ff7ca7fe4bdf1e033c0ed821593284f98dcabb05d23e8c9795f53c9b6016f58' 
  AND token = '+XgveqqaSZ2WspOvlES5Bti1bIEcoMRYrcLoEyyvm0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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