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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '795f0a791aa670fb99e0a51271e5954da31b6287f2a8ed8160d892ba7231eee7' 
  AND token = 'xvRbd3dRqb26rQDyz6iSb7p2mPMZXmOq9DUJTNSrLfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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