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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c89370a36d86b29ace158f18bd710b8da6e784df98d1b6df16a944da024bae39' 
  AND token = 'oSbkYYHzdfT6Hi07J+n/bXx3OM4CG3JorcXLaQyJkro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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