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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6522aba04b4ef937e197403587987008930aaf1d1ab7fa5e949226cf193705d9' 
  AND token = 'RBB4HAeXmo/WGai6hT19Nw4Pq4BvYbZGNWWsGLl6RIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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