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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8184b8761c6c5aceb6cb34085b8829988dd6c7521ab24205f02f89a5f07a4a37' 
  AND token = 'R2zc9m4jgQ2Oj0joVcvGpNpksH2v+Lxu8bGTYsbeZcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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