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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96737446e76654f1059b255b3d2f372cf4ef2eafc69084f30f25e9a267f1cd37' 
  AND token = 'kX3E9hTOFRTmbaSUJzl/ECrv4hO3YudnqhFWRMfb4qw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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