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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d5b33b0ca8ab80551dd31ba2be9f6f4f66d58e155d42210e369fe1a6b25f28b' 
  AND token = '9dOwYqTKzhVneCf+D3i2QZkvsPRbZvkI8n5aDwpP16Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00089

JSON explain

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