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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8132e3f51162058f64f1a60a15d4b7ed01e73659e97637b1afc10bef0c412e45' 
  AND token = 'C9EREYb0WvGVprFUscz+yIbU52U0M5xIlfCi8RacJmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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