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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97fc1210051c373a350d3b35b18067a1463d43b356750b8100b14ababd46dee1' 
  AND token = '5Mf0REbL93FHOc2yzyi1Od9Lr5yDbHfPGoZr4o6PsyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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