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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaaf3a00f34e274a4e0fa9d50c5a8d4d02b89bc23a2870f871b95a5da8fa67f2' 
  AND token = '7AWNTr2OtbgW5bDhYWpr1y/pJ8ERSEiGMKEmUtuqtMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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